A Nearly Polar Orbit for the Extrasolar Hot Jupiter WASP-79b

Abstract

We report the measurement of a spin-orbit misalignment for WASP-79b, a recently discovered, bloated transiting hot Jupiter from the WASP survey. Data were obtained using the CYCLOPS2 optical-fiber bundle and its simultaneous calibration system feeding the UCLES spectrograph on the Anglo-Australian Telescope. We have used the Rossiter-McLaughlin effect to determine the sky-projected spin-orbit angle to be lambda = -106+19-13 degrees. This result indicates a significant misalignment between the spin axis of the host star and the orbital plane of the planet -- the planet being in a nearly polar orbit. WASP-79 is consistent with other stars that have Teff > 6250K and host hot Jupiters in spin-orbit misalignment.

8 pages, 2 figures, in press ApJL (accepted 2 August 2013)

References in corpus (4)

• Dynamical Outcomes of Planet-Planet Scattering
• Formation of Hot Planets by a combination of planet scattering, tidal circularization, and Kozai mechanism
• WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus
• CYCLOPS2: the fibre image slicer upgrade for the UCLES high resolution spectrograph

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